Pipe bending device



March ,6, 1934. W H MAR-HN 1,949,938

PIPE BENDING DEVICE Filed July 25. 1953 WITNESS INVENTORMU.

Patented Mei. e, 1934 1,49,38

UNITED STATES PATENT FFICE PIPE BENDING DEVICE William H. Martin, Owensboro, Ky., assigner to H. P. Martin & Sons, Owensboro, Ky., a copartnership composed of William H. Martin, Charles L. Martin, and Clarence F. Martin Application July 26, 1933, Serial No. 682,321

Claims. (Cl. 153-40) My invention relates to improvements in pipe a pin 18. This body portion is provided with bending devices, and it consists in the combinagrooves 19 and 20 respectively, to constitute tions, constructions and arrangements herein forming rolls, and it is also provided with an described and claimed. integral gear` 21, which is in mesh with the f 5 An object of my invention is to provide a degear 15. 60' vice which is primarily intended for bending One side of the body portion 17 is attened, small pipes such as three-eighths inch and oneas Shown at 22, and to this side is pivotaily conhalf inch copper tubing, which may be operated nected a double pointed hOOk 23, by means 0f by the hands without the necessity of other holda pivot bolt 24, or in any other suitable manner.

ing devices, and with which bends up to and in- From the foregoing description of the various 65# cluding 180 degrees can be made, parts of the device the operation thereof may be A further object of the invention is to proreadily understood. The OperatOl glftspe the vide a device in which friction is reduced and handle 7 with Orle hand, and With the Other hand in which the scoring of the tubing is obviated he passes the end of the tube 25 in contact with by the provision of combination driving and one oi the guide rollers, such as the roller` 1.1, 70 forming rolls. and between the driving roll 14 and the forming A further object of the invention is to provide 1011 20. The hOOk 23 iS DOW breught around tO a device of the type described which een be engage the tube, es Shown in Figs. 1 and 4.A The turned over and used from either side, making Wrench 16 is now swung from the position shown 20 it convenient to make either right or left bends. in Fig. l t0 met ShOWH l Fg- 2, and Sillee the 75 A further object is to provide idler and formsears 15 and 21 ere in mesh, the body portion 1'?, ing rolls so that two diterent sizes of tubing which bears the roll 20 is rotated counter-clock; can be bent without Changing Touswise, and the hook 23 which is carried around Other objects and advantages will appear in by the bedy IJOIOII 17, drags the tube 25 With it.

25 the following specification and the novel features In Fig. 2 I have illustrated a 90 degree bend. 803 of the invention will be particularly pointed out but it will be obvious that on further rotation in the appended claims. of the handle 16, the tube will be bent at any My invention is illustrated in the acoompanyangle up to substantially 180 degrees. On long ing drawing forming part of this application, in tubes where it is necessary to make a bend at 3@ which: some distance from the end of the tube, and 85 Figui-e 1 is a Side elevation of the device Showtherefore inconvenient to thread the tube being the apparatus in one position; tween the rolls, the pin 18 and the forming rolls Figure 2 is a similar view showing it in an- 19 and 20 Wheh tre mounted O11 the pin, may other position; be removed and the tube may then be laid bet Figure 3 is e, bottom plan View; tween the frame arms against the idler and the 90' Figure 4 is a. section on the lino 4 4 of Fig driving roll. The hook 23 is then brought into 2, and engagement with the tube after the forming rolls Figure 5 is e section on the line 5 5 of Fig. 1. ere replaced and the pin 18 inserted. The opera- In carrying out my invention I provide a U- tion of bending is then made by turning the shaped frame 6 to which is secured a handle 7. Wrench 16, aS heYetOfOre described. 95';4 As win be observed in Fig. 1, this frame has To make opposite bends, thatisrehts andleft, extensions like that shown at S, on eeen side, in long lengths of tubing, the machine is simply in which are iournalled the trunnicns 9 of idlers turned Over and the Iaehet Wrench Dieeed Gn 1G and 11 respectively, see Fig. 5. the trunnion on the opposite side and operated I In a plane common with the axis of the truns0 as to cause the hook to drag the tube and bend 100 nions 9 are trunnions 12, which are journalled it in en OlelJOSte dleetel from that deSCrbed at in the sides of the U-shaped member 6, by means first. of which driving rolls 13 and le respectively are It will be noted that the driving rolls are carried. Secured to and integral therewith is smooth, and that the major driving movement is a driving gear l5. The ends of the trunnions performed by the engagement of the gear 15 with 105 12 project as shown in Fig. 5, and are provided the gear 21, so that there is no danger of scoring with flat surfaces by means of which a ratchet the tube by corrugations or teeth on the driving wrench 16 may be applied to either end. rolls.

As will be seen from Figs. 1 and 4, a cylin- It will be seen from the above description that drical body portion 17 is rotatably mounted on the device is a light portable machine for bendlit) ing tubes, pipes, etc., by means of the operators hands, in such a manner that the tube is prevented from buckling or being scored.

I claim:

1. A pipe bending device comprising a frame, a forming roll rotatably mounted in the frame, a gear carried by the forming roll, a driving roll rotatably mounted in the frame, a gear carried by the driving roll and arranged to engage the gear carried by the forming roll, an idler roll rotatably mounted on the frame in a common axial plane with the driving roll, and a hook pivotally connected with the forming roll and arranged t0 engage the pipe.

2. A pipe bending device comprising a frame, a forming roll rotatably mounted in the frame, a gear carried by the forming rool, a driving roll rotatably mounted in the frame, a gear carried by the driving roll and arranged to engage the gear carried by the forming roll, a driving roll rotatably mounted on the frame in a common axial plane with the driving roll, a hook pivotally connected with the forming roll and arranged to engage the pipe, a handle for the frame on the opposite side of the driving roll from the forming roll, and means for actuating the driving gear to cause the rotation of the driving and forming rolls.

3. A portable pipe bending device comprising a AlJ-'shaped frame having a handle secured to the central portion thereof, a driving roll having trunnions rotatably mounted in said frame near said handle, said trunnions being extended beyond the frame on either side thereof, an integral gear carried by said driving roll, a forming roll rotatably mounted in said frame and having an integral gear arranged to engage the gear of the driving roll, said forming roll being removable and replaceable, an idler roll pivotally mounted in said frame on an axisparallel to the axis of the driving roll, and a hook pivotally secured to the forming roll and arranged to engage the pipe and to drag it when the driving and forming rolls are turned in a predetermined direction.

4. A pipe bending device comprising a U-shaped frame, a handle secured to the frame at the central portion thereof, a driving roll having trunnions rotatably mounted in said frame, said trunnions projecting beyond the frame and having attened end portions adapted to receive a. wrench on either of said flattened portions, a forming roll disposed between the arms of the frame, a removable pivot pin for said forming roll, a driving gear integral with said driving roll, a gear integral with the forming roll and arranged to enmesh with the gear of the driving roll, a portion of the forming roll being cut away to provide a flat surface, an idler roll rotatably mounted in the frame on an axis parallel to that of the driving roll, and a hook pivotally mounted on the at surface of the forming roll and having oppositely directed end portions arranged to engage the pipe and to drag it when the driving roll is turned in a predetermined direction.

5. A pipe bending device comprising a U-shaped frame having a central extension, a handle member secured to said central extension, a plurality of grooved driving rolls of different sizes, a driving gear associated with said driving rolls, trunnions for said driving gear and driving rolls, said trunnions extending through the sides of the U-shaped frame and having flat portions for engagement by a wrench, a plurality of idler rolls rotatably mounted in the U-shaped frame on an axis parallel with that of the driving rolls, said idler rolls corresponding in size and position to the driving rolls, respectively, a cylindrical body portion disposed between the U-shaped arms, a pivot pin for rotatably mounting said cylindrical body portion, said body portion having peripheral grooves of sizes corresponding to the grooves of A the driving rolls, a gear formed on said block and arranged to mesh with said driving gear, said block having a cut-away portion to provide a flat surface, a hook pivotally mounted on the flat surface of said block and having oppositely directed ends arranged to engage the pipe to be bent, and to drag it between the forming and driving rolls when the latter are turned in a predetermined direction.

WILLIAM H. MARTIN.

IAG 

